Problem Set 3 CE 4400 1-For a CPT test at a specific depth if qc=20 tsf, Rf=2.5%, u2=2.0 tsf, a=0.80, n=1.0, total vertical stress=4.2 tsf, and effective vertical stress=2.4 tsf, classify the soil. 2-Using the CPT data in figure below, a unit weight of 115 pcf, and an overconsolidation ratio of 3, determine (a) soil behavior type (b) o' using Kulhawy and Mayne correlation and (c) N60 for the soil between depths of 21 and 23 ft based on a groundwater depth of 15 ft below the ground surface and average qc of 190 tsf, average Rf of 3% and u2=0. Also, assume a=0.80, and n=0.411. Portion of CPT test of interest 15 20 T 25 111 80 6 4 2 0 75 150 225 300 0 4 8 0 6 12 Ssc (tsf) qc (tsf) RE (%) u (tsf) 3- For a CPT test at a specific depth, if the soil material is clay, qt=15.8 tsf, total vertical stress=2.28 tsf, and effective vertical stress=2.28 tsf, calculate OCR, pre-consolidation pressure, and undrained shear strength of the clay.